/* * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * vnet/buffer.h: vnet buffer flags * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef included_vnet_buffer_h #define included_vnet_buffer_h #include <vlib/vlib.h> /* VLIB buffer flags for ip4/ip6 packets. Set by input interfaces for ip4/ip6 tcp/udp packets with hardware computed checksums. */ #define LOG2_IP_BUFFER_L4_CHECKSUM_COMPUTED LOG2_VLIB_BUFFER_FLAG_USER(1) #define LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT LOG2_VLIB_BUFFER_FLAG_USER(2) #define IP_BUFFER_L4_CHECKSUM_COMPUTED (1 << LOG2_IP_BUFFER_L4_CHECKSUM_COMPUTED) #define IP_BUFFER_L4_CHECKSUM_CORRECT (1 << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT) /* VLAN header flags. * These bits are zeroed in vlib_buffer_init_for_free_list() * meaning wherever the buffer comes from they have a reasonable * value (eg, if ip4/ip6 generates the packet.) */ #define LOG2_ETH_BUFFER_VLAN_2_DEEP LOG2_VLIB_BUFFER_FLAG_USER(3) #define LOG2_ETH_BUFFER_VLAN_1_DEEP LOG2_VLIB_BUFFER_FLAG_USER(4) #define ETH_BUFFER_VLAN_2_DEEP (1 << LOG2_ETH_BUFFER_VLAN_2_DEEP) #define ETH_BUFFER_VLAN_1_DEEP (1 << LOG2_ETH_BUFFER_VLAN_1_DEEP) #define ETH_BUFFER_VLAN_BITS (ETH_BUFFER_VLAN_1_DEEP | \ ETH_BUFFER_VLAN_2_DEEP) #define LOG2_BUFFER_HANDOFF_NEXT_VALID LOG2_VLIB_BUFFER_FLAG_USER(6) #define BUFFER_HANDOFF_NEXT_VALID (1 << LOG2_BUFFER_HANDOFF_NEXT_VALID) #define LOG2_VNET_BUFFER_LOCALLY_ORIGINATED LOG2_VLIB_BUFFER_FLAG_USER(7) #define VNET_BUFFER_LOCALLY_ORIGINATED (1 << LOG2_VNET_BUFFER_LOCALLY_ORIGINATED) #define LOG2_VNET_BUFFER_SPAN_CLONE LOG2_VLIB_BUFFER_FLAG_USER(8) #define VNET_BUFFER_SPAN_CLONE (1 << LOG2_VNET_BUFFER_SPAN_CLONE) #define foreach_buffer_opaque_union_subtype \ _(ethernet) \ _(ip) \ _(swt) \ _(l2) \ _(l2t) \ _(gre) \ _(l2_classify) \ _(handoff) \ _(policer) \ _(ipsec) \ _(map) \ _(map_t) \ _(ip_frag) \ _(tcp) /* * vnet stack buffer opaque array overlay structure. * The vnet_buffer_opaque_t *must* be the same size as the * vlib_buffer_t "opaque" structure member, 32 bytes. * * When adding a union type, please add a stanza to * foreach_buffer_opaque_union_subtype (directly above). * Code in vnet_interface_init(...) verifies the size * of the union, and will announce any deviations in an * impossible-to-miss manner. */ typedef struct { u32 sw_if_index[VLIB_N_RX_TX]; union { /* Ethernet. */ struct { /* Saved value of current header by ethernet-input. */ i32 start_of_ethernet_header; } ethernet; /* IP4/6 buffer opaque. */ struct { /* Adjacency from destination IP address lookup [VLIB_TX]. Adjacency from source IP address lookup [VLIB_RX]. This gets set to ~0 until source lookup is performed. */ u32 adj_index[VLIB_N_RX_TX]; union { struct { /* Flow hash value for this packet computed from IP src/dst address protocol and ports. */ u32 flow_hash; /* next protocol */ u32 save_protocol; /* Rewrite length */ u32 save_rewrite_length; /* MFIB RPF ID */ u32 rpf_id; }; /* ICMP */ struct { u8 type; u8 code; u32 data; } icmp; /* IP header offset from vlib_buffer.data - saved by ip*_local nodes */ i32 start_of_ip_header; }; } ip; /* * MPLS: * data copied from the MPLS header that was popped from the packet * during the look-up. */ struct { u8 ttl; u8 exp; u8 first; } mpls; /* ip4-in-ip6 softwire termination, only valid there */ struct { u8 swt_disable; u32 mapping_index; } swt; /* l2 bridging path, only valid there */ struct opaque_l2 { u32 feature_bitmap; u16 bd_index; /* bridge-domain index */ u8 l2_len; /* ethernet header length */ u8 shg; /* split-horizon group */ u16 l2fib_sn; /* l2fib bd/int seq_num */ } l2; /* l2tpv3 softwire encap, only valid there */ struct { u32 pad[4]; /* do not overlay w/ ip.adj_index[0,1] */ u8 next_index; u32 session_index; } l2t; struct { u32 src, dst; } gre; /* L2 classify */ struct { struct opaque_l2 pad; union { u32 table_index; u32 opaque_index; }; u64 hash; } l2_classify; /* IO - worker thread handoff */ struct { u32 next_index; } handoff; /* vnet policer */ struct { u32 pad[8 - VLIB_N_RX_TX - 1]; /* to end of opaque */ u32 index; } policer; /* interface output features */ struct { u32 flags; u32 sad_index; } ipsec; /* MAP */ struct { u16 mtu; } map; /* MAP-T */ struct { u32 map_domain_index; struct { u32 saddr, daddr; u16 frag_offset; //Fragmentation header offset u16 l4_offset; //L4 header overall offset u8 l4_protocol; //The final protocol number } v6; //Used by ip6_map_t only u16 checksum_offset; //L4 checksum overall offset u16 mtu; //Exit MTU } map_t; /* IP Fragmentation */ struct { u16 header_offset; u16 mtu; u8 next_index; u8 flags; //See ip_frag.h } ip_frag; /* COP - configurable junk filter(s) */ struct { /* Current configuration index. */ u32 current_config_index; } cop; /* LISP */ struct { /* overlay address family */ u16 overlay_afi; } lisp; /* Driver rx feature */ struct { u32 saved_next_index; /**< saved by drivers for short-cut */ u16 buffer_advance; } device_input_feat; /* TCP */ struct { u32 connection_index; u32 seq_number; u32 seq_end; u32 ack_number; u16 hdr_offset; /**< offset relative to ip hdr */ u16 data_offset; /**< offset relative to ip hdr */ u16 data_len; /**< data len */ u8 flags; } tcp; u32 unused[6]; }; } vnet_buffer_opaque_t; /* * The opaque field of the vlib_buffer_t is intepreted as a * vnet_buffer_opaque_t. Hence it should be big enough to accommodate one. */ STATIC_ASSERT (sizeof (vnet_buffer_opaque_t) <= STRUCT_SIZE_OF (vlib_buffer_t, opaque), "VNET buffer meta-data too large for vlib_buffer"); #define vnet_buffer(b) ((vnet_buffer_opaque_t *) (b)->opaque) /* Full cache line (64 bytes) of additional space */ typedef struct { union { }; } vnet_buffer_opaque2_t; #endif /* included_vnet_buffer_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */